Max-Fan Pro Series fans are the next generation of in line mixed-flow fans capable of even more effecient and stronger performance than the original Max-Fan. Manufactured in Germany the Pro Series of fans has a much more robust housing due to the fiberglass reinforced plastic compounds that meet all of the UL and CSA requirements. Aerodynamically optimized laminar airflow and extremely high efficiency set the Pro series in a class of its own and those seeking the highest quality in professional grade fans know there is only one option for true and reliable performance, Max-Fan.